rust_ex6.rs

// this does not compile

fn middle_name(full_name: &str) -> &str {
    full_name.split_whitespace().nth(1).unwrap()
}

fn main() {
    let res;
    {
        let name = String::from("Harry James Potter");
        res = middle_name(&name);
    }
    assert_eq!(res, "James");
}